The suspected gunman in a triple slaying in Stafford surrendered Monday night to Harris County authorities, officials said.

La-Melvin Johnson, 35, was with community activist Quanell X when he surrendered into police custody about 10 p.m. Monday, officials said.

Johnson was charged with capital murder after three people were killed in a shooting Sunday morning at the Royal Wash Mobile Detailing & Car Wash on Avenue E near Murphy Road.

James Leedom, spokesman for the Stafford Police Department, said Johnson and several other employees showed up at the car wash for a special event to detail cars about 10:15 a.m. However, because of rainy weather, the event was canceled.

The owner told the workers he would give them some pay for showing up, Leedom said, but an apparently upset Johnson went to his car, grabbed a gun and started shooting.

"This is all workplace related," Leedom said.

One of the victims died at the scene. Officials said two other victims, both men, were rushed to Memorial Hermann Hospital, where they later died.